problem with xalan:evaluate()

[Filkorn Roman]

Hi all,   I am trying to use extension function 'http://xml.apache.org/xalan:evaluate' with this results:   - if parameter is something what can be evaluated (for example: '{view:format($Formatter,"user")}' ), everything goes right.   - if parameter is combined (text & ..., for example: 'StartServlet&UserID={view:getUser($Formatter)}'), NullPointerException is thrown (see below).   (examples are not exact from my templates, so please don't check their syntax)   Please, am I doing something wrong? I didn't find documentation for 'evaluate' and I am not sure if such a problem is not mentioned in there.   Thank you very much for any kind of info (except of RTFM :-),   Roman   p.s. Sorry, I forgot: tried with Xalan J-2.2.     XSLTProcessor.tranform: javax.xml.transform.TransformerException: java.lang.NullPointerException javax.xml.transform.TransformerException: java.lang.NullPointerException         at org.apache.xalan.extensions.ExtensionHandlerJavaClass.callFunction(ExtensionHandlerJavaClass.java:357)         at org.apache.xalan.extensions.ExtensionsTable.extFunction(ExtensionsTable.java:257)         at org.apache.xpath.functions.FuncExtFunction.execute(FuncExtFunction.java:181)         at org.apache.xpath.Expression.executeCharsToContentHandler(Expression.java:301)         at org.apache.xalan.templates.ElemValueOf.execute(ElemValueOf.java:319)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.transformer.TransformerImpl.transformToRTF(TransformerImpl.java:1729)         at org.apache.xalan.templates.ElemVariable.getValue(ElemVariable.java:327)         at org.apache.xalan.templates.ElemVariable.execute(ElemVariable.java:282)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:710)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:710)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:710)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:710)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:710)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(TransformerImpl.java:2012)         at org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1175)         at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:642)         at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1092)         at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1070)         ... --------- java.lang.NullPointerException         at org.apache.xpath.objects.XRTreeFrag.object(XRTreeFrag.java:119)         at org.apache.xalan.extensions.ExtensionHandlerJavaClass.callFunction(ExtensionHandlerJavaClass.java:307)         at org.apache.xalan.extensions.ExtensionsTable.extFunction(ExtensionsTable.java:257)         at org.apache.xpath.functions.FuncExtFunction.execute(FuncExtFunction.java:181)         at org.apache.xpath.Expression.executeCharsToContentHandler(Expression.java:301)         at org.apache.xalan.templates.ElemValueOf.execute(ElemValueOf.java:319)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.transformer.TransformerImpl.transformToRTF(TransformerImpl.java:1729)         at org.apache.xalan.templates.ElemVariable.getValue(ElemVariable.java:327)         at org.apache.xalan.templates.ElemVariable.execute(ElemVariable.java:282)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:710)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:710)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:710)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:710)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:710)         at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:420)         at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:226)         at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2186)         at org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(TransformerImpl.java:2012)         at org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1175)         at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:642)         at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1092)         at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1070)   ...